Tool-grinding machine.



PATENTED JULY 28. 1903.

" J. s. BANUROFT.

rrooL GRINDING MACHINE.

APPLICATION FILED APB.. 11, 1903.

4 SHEETS-SHEET 1.

N0 MODEL.

1N: mmm

s PEIER: co. Pb-lommrno., wAsmNcTom p. s.

PATENTED JULY 28, 1903.

J. S. BANCROPT.

TOOL GRINDING MACHINE.

AryLIoATIoN FILED un. 11. 190s.

4 SHEETS-SHEET 2.

`NO `MODEL.

Willi/Illa!!! PATENTED JULY 28, 1903.

J. S. BANGROPT. Toor. GRINDING MAGHINE. APPLIUATION FILED APE, 11. 1903.

4 SHEETS-SHEET 3.

'N0 MODEL.

No. 734.799.` PATENTED JULY 28. 1903.

` f J. S. BANCROFT.

TOOL GRINDING MACHINE.

` APPLICATION FILED APB.. 11, 1903. N0 MODEL. 4 SHEETS-SHEBT i.

lll: /7' H W l? j ITO, 734,799.

Patented July 28, 1903.

PATENT OFFICE,

JOHN SELLERS BANOROFT, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO WILLIAM SELLERS AND 'OF PENNSYLVANIA.

ACOMPANY, INCORPORATED, A CORPORATION i TOOL-GRINDING MACHINE.

:LPECIFIJ ATION forming part of Letters Patent No. 734,799, dated July 28S, 1903.

Application inea April 11. 190s.

To all whom t may concern.: j,

Beit knownV that I, JOHN SELLERS BAN- CROFT, a citizen of `the United States',residing at Philadelphia, county of Philadelphia, and

5 State of Pennsylvania, have invented a new and useful Improvement in Tool-Grinding Machines, of which the following is a full,

l clear, and exact description, reference being 4 had to the accompanying drawings, which lo form a part of this specification.

` With machines for grinding the faces, and

thus forming the faces, of cutting-tools used on machines it has been customary to arrange the vertical slide-rest so that it may be moved .t5 up and down in avertical line parallel to the plane of rotation ofthe grinding-Wheel. The `operative means used for moving this sliderest up and down was a hand-lever operated by the hand of the workman. In the general 2o run of cutting-tools of moderate weight and t in which the amount of grinding required is comparatively slight this arrangement is entirely satisfactory, and, in fact, possesses certain advantages,becau'se the workman can 25 readily and instinctively produce just suffici'ent motion to make contact between the tool and grinding-wheel to cover the face of the former, and thus use only as much of the entire motion of the vertical slide as is nec- 3o essai-y. Whemhowever, verylarge'and heavy tools are to be ground or when the amount to be removed is considerable, the labor of moving the tool up and downin contact with the grinding-wheel has become too great to be 35, readily performed by the hand.

One of the objects of my invention is to provide mechanism wh'erebythe vertical sliderest shall be moved up and `down by power mechanism.

Another object is to so adjust the power mechanism as to provide for only such length of movement of the power mechanism, and thus the vertical slide-rest, asmay be necessary to do the' work required in each case as -45 it arises.

It is a'further object of my invention to provide a hand mechanism for moving the vertical slide up and down and to provide means whereby the motion can be changed 5o from hand to power quickly, readily, and with `Speaking more specifically, I accomplish this vremain symmetrical on both sides of the line ered,

-quircments- Serial No. 152,129. (No model.)

vide a connection between this plate and the vertical slide-rest which will cause the Verlical slide-rest to move up and down with the vibrations of the plate. At the same time this connection may be adjusted in relation to the axis up'on which the plate vibrates so that the motion given to thc slide-rest, and thus the tool being ground, may vary in extent from nothing to the maximum required.

last-mentioned purpose or object by adjusting the pin forming the connection between the plateand connecting-rod in relation to the axis of vibration of the plate so that the connecting-rod on this pin will give motion to the 7o `tool being ground in extent Varying from nothing to t-he maximum required, the adjustment of the pin being accomplished by means of a block upon an arm hinged to the plate at a point coinciding with the axis of the pin when at the position of maximum motion, so that as the block is moved in the vibration or amount of motion will be diminished, but will connecting thehinged point of arm with the axis of vibration ofthe plate so long as the armiis parallel with this line; but if the arm is adjusted about the hinge-joint andisturned onthe plate atan angle with the arm, then the position of the motion will be raised or low- I also arrange a guard for the purpose of limiting the amount of adjustment ofthe arm upon its hinge, accordingto the distance of the axis of the connecting-rod pin from the axis of vibration of plate, so that with any given amount of motion for the pin this motion cannot extend above nor below a certain fixed point determined by practical re- Further, the arrangement is such that as this motion diminishes Vby the "adjustment of the pin nearer to the axis of the axis of the pin coincides with the axis of 10o ytion of the driving-pulley, crank, and rockarm. Fig. 4 is an elevation of the vibrating plate, adjustable arm and slide, and end of the connecting-rod; Fig. 5, an underneath view of the same. Fig. 6 isa transverse section of the same, taken on the line a b of Fig. 4. Fig. 7 is a plan view showing a horizontal section on the line c d of Fig. l and showing the hand-lever and lower rock-arm and the means for connecting and disconnecting the hand and power motions. Fig. S is a front elevation, and Fig. 9, a side elevation, of the same; and Fig. 10 is a verticalsection on the line efof Fig. 2. Fig. 11 is a view of modified form of locking mechanism.

A is the grinding-wheel, and B the chuck for holding the tool to be ground. The chuck B can be rotated through any required angle and clamped, and can be adjusted by means of the slide-rests C and D in two directions, one parallel and the other perpendicular to the vertical tangent plane of the grindingsurface of the wheel A. The tool is clamped in the chuck and the latter rotated so as to bring the face to be ground into a vertical plane at the desired angle with its face. This face is then brought into contact with the Wheel A by means of the slide-rests C and D, which are mounted on top of the drum or vertical slide-rest E, which has a motion up and down of sufficient extent to insure that the largest tool-surface will completely pass the line of contact with the grinding-wheel A. The required length of this vertical motion must be Varied, because the several faces of the same tool and the faces of different tools are not of the same length, and as these faces may not be symmetrical about the axis of the chuck B the total motion must be still further lengthened in order to reach the ends of such faces as extend much above y or below this axis.

' fastened to the rock-shaft W. The hand-le- Ver X works freely on the shaft W, as does also the lever Y. The lever Z is fastened to the rock-shaft W, and consequently any motion that the lever Z receives will be transmitted through rock-shaft W, the lever V, link U, andpin T to cause the movement of the vertical slide-rest or drum E. The 1evers X, Y, and Z have each a slot g of the same shape and so located that when the le- Vers are all in their central position these slots will coincide. At the center of the slot in the lever Zis hinged a bolt 7L in such manner that when swung in one direction it enters the slot in lever Y, and thus couples the levers Y and Z together, and any motion given to lever Y is imparted to lever Z. Vhen' the bolt h is swung in the other direction, it enters the slot in the lever X and con- 4 nects the lever X and the lever Z together and any motion given to leverXis transmitted through lever Z. As may be seen, also by this arrangement, it isimpossible for both levers X and Y to he at the same time coupled to lever lZ. In Fig. 1l I have shown an alternative construction to that just described. In this construction Z is a modification of lever Z and h' is a' sliding bolt to take the place of swinging bolt h. This sliding bolt h is either the same or less length than the slot in lever Z', which it fits, and consequently its end cannot enter the slot in either lever X or Y until its other end is entirely out of the slot in the other.v

To the lever Y is connected the lower end of the connecting-rod S. The upper end of this connecting-rod S is connected to a pin R, carried by the block P. This block P is slidably connected to the arm M and may be tixedly attached thereto at any point through the medium of the clamping-screw Q. The arm M has the fulcrum-pin N fitting a hole in the vibrating plate L. The plate L has its edge a formed in the arc of a circle having the axis of the fulcrum-pin N as its center. The arm M has at one end aportion tted to this arc and carries a clamp T' for retaining it at any point` on this arc.

K is a shaft on which the plate L is'fastened. On the other end of the shaft the lever J is fastened.

I is the connecting-rod connecting the lever J with the crank H upon the shaft G. Upon the shaft G is the driving-pulley F. The radius of the lever J being greater than that of the crank H the former receives a vibratory motion from the rotation of the latter. This Vibratory motion is transmitted thron gh shaft K to the vibratory plate L, giving through arm M and pin R an up-and-down motion to the connecting-rod S, which when the lever Y is connected to the lever Z is transmitted to and causes a corresponding up-and-down movement to the vertical slide-rest. By moving the block P along the arm M t-he movement of the connecting-rod S may be varied from maximum vibratory motion with pin R near the center of the pin N to the position of no vibration where the center of the pin R coincides with the center of the shaft K. When the arm M is, as shown in Fig. 4, parallel with a line passing through the hinged ICO TIO

point of the arm N, the axis of vibration K of plate L, and the pin Rforall the different `positions of the block upon the arm M the ing thehinged point and theshaft K, then the position of the motion of pin R will be g raised and lowered in relation to its original position, according as arm M has been swung up or swung down and to the extent the arm p une with the axis of Shaft K tht-,distance bei is M has been so swung.

It is advisable, however, to provide means which will prevent the extremes of maximum motion to be irnparted to the tool-holding chuck being overrun. It is also desirable that when this motion is reduced to zero the tool should be in its central position-t'. e., the arm Ml brought to its central position and the pin R coincident with the axis of shaft K. In order to accomplish this result, I provide the following mechanism: Upon the plate L, I secure a guard-rail Z, and upon the block P, I secure a pin p. This rail is so shaped that the pin p in any position of the block P, when the arm M is swung on the fulcrum-pin N, above or below the central position, will strike guardlwithin the extremes of the maximum motion ot the tool-holding chuck. The upper and lower portions otA rail 'l also converge towardeach other, so that at a'point in tween them is such as to allow no substank tial movement of pin p, and the position is such that when the pin p is at that point the pin R coincides with the axis of the shaft K. Thus to bring the block P to zero position the arm M must be moved central and the pin R coinciding with the axis of shaft K, thus bringing the tool central when the 1 block is brought to the zero position.

Having now fully described myinvention, what I claim, and desire to protect by Letters Patent, is-

1. In a tool-grinding machine, in combinaftion, with the vertically-movable slide-rest,

` of a vbratory plate, a'device connected to said plate, so as to vary its lateral p osition with reference to the axis of vibration of said plate, mechanism to elevate said verticallymovable slide-rest and connection between said device and said mechanism.

2. In a tool-grinding machine, in combination, with the vertically-movable slide-rest, of a vibratory plate, a device connected to said plate so as to vary its lateral and vertical position with reference to the axisof vibration of said plate, mechanism to elevate said vertically-movable slide-rest and connection between said device and said mechanism.

3. lIn a tool-grinding machine, in combination, with the vertically-movable slide-rest, of a vibratory plate, a device connected to said plate so as to vary its lateral and vertical position with reference to `the axis of vibration of said plate, mechanism to elevate said vertically-movable slide-rest and connection between said device and said mechanism, and a guard for limiting the vertical movement of said device.

4. In a tool-grinding machine, in combination, with the vertically-movable slide-rest, of a Vibratory plate, an arm secured to said plate, a block movable along said arm, a connecting-rod secured to said arm and connection between said rod and the vertically-movableslid e-rest.

5. In a tool-grinding machine, in combination, with the vertically-movable slide-rest, of a vibratory plate, an arm secured to said plate, a block movable along said arm, a connecting-rod secured to said arm and connection between said rod and the vertically-movable slide-rest, the point of connection of said rod to the block being such that when the block is in vertical alinement with the .axis of said plate, the con necting-point of said rod and block is coincident with the axis of vibration of the plate.

6. In a tool-grinding machine, in combination with the vertically-movable slide-rest, of a vibratory plate, an arm pivoted to said plate, a block movable along said arm, a connecting-rod secured to said arm, connection between said rod and the vertically-movable slide-rest, and means to limit the movement of the ar-m upon the pivot.

7. In a tool-grinding machine, in combination, with the vertically-movable slide-rest, of a' vibratory plate, an arm pivoted to said plate, a block movable along said arm, a connecting-rod secured to said arm and connection between said rod and the vertically-movable slide-rest, and means to bring the arm and block into such position that the point of connection of the block and connectingrod is coincident with the axis of the plate.

8. In a tool-grinding machine, in combination, a vibratory plate, an arm connected to said plate, and a block slidably mounted upon said arm.

9. In a tool-grinding machine, in combination, a vibratory plate, an arm pivoted to said plate, the plate having an edge curved from a center coincident with the pivot-point of the arm, and a clamp for clamping the arm to the plate at the curved portion thereof.

l0. In a tool-grinding machine, in combination', a vibratory plate, an arm pivoted to said plate, a block slidably mounted upon said arm, and a device for limiting the movement of the arm upon its pivot.

l1. In a tool-grinding machine, in combination, a vibratory plate, an arm pivoted to said plate, a block slidably mounted upon said arm, and a device adapted, when the block is in vertical alinement with the axis of the plate, to compel the arm to assume a fixed position with reference to said axis.

l2. In a tool-grinding machine, in combination, a vibratory plate, an arm pivotedl to IIO 13. In a tool-grinding machine, in combinat-ion, a vibratory plate, an arm pivoted to said plate, a block slidably mounted upon y said arm, a pin secured to said block and a stop secured to said plate in vertical alinement with the axis of said plate to prevent he movement of the arm upon the pivot when the block is in vertical alinement with said axis.

14:. In a tool-grinding machine,.in combination, a vbratory plate, an arm pivoted to said plate, a block slidably mounted upon said arm, a pin secured to said block and a rail secured to said plate above and below said block, said rails converging together to a point in vertical alinement with the axis of the plate. v

15. Ina machine of the character described,

. in combination, with a vertically-movable slide-rest, a lever and connection between said lever and vertically-movable slide-rest, of independent operating-levers and a locking device carried by the first-named lever adapted to engage either of the lastnan1ed levers.

16. In a machine ofthe character described, in combination, with a vertically-movable slide-rest, a lever having a slot and connection between said lever and vertically-movable slide-rest, of two independent levers each having slots, the slots of the first-mentioned lever and last-mentioned levers being adapted to he brought in alinement'and a locking-pin pivoted in the slot of the lastmentioned lever.

In testimony of which invention I have hereunto set my hand at Philadelphia on this 4th day of April, 1903.

JOHN SELLERS BANCROFT. 

